/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshMaterialFunctions.h
Enables per-triangle Material IDs on a mesh and initializes the values to 0. If Target Mesh already has Material IDs, this function will do nothing.
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * EnableMaterialIDs ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, [UGeometryScriptDebug](API\Plugins\GeometryScriptingCore\GeometryScript\UGeometryScriptDebug) * Debug )